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LEASES - Maturities of lease liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Undiscounted cash payments:    
2021 (remainder of year) $ 79  
2022 158  
2023 92  
Total lease payments 329  
Less imputed interest (28)  
Total operating lease liabilities 301 $ 363
Centennial, Colorado    
Undiscounted cash payments:    
Total lease payments $ 300